Air purifier



FIG. 1 is a perspective view of an air purifier of the present invention;

FIG. 2 is a front view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a right side view thereof, wherein the left side view is a mirror image of the right side view with respect to plane A that extends perpendicular to the page of FIG. 4;

FIG. 5 is a back view thereof; and,

FIG. 6 is a bottom view thereof.

Any broken lines in the drawings are for illustrative purposes only and form no part of the claimed design. 

We claim the ornamental design for an air purifier, as shown and described. 